"Eight-Tails, Version 2!!" (八尾、バージョン2!!, Hachibi, Bājon Tsū!!) is chapter 471 of the original Naruto manga.
Fū, in control of Ao's body, tries to remove his Byakugan. Various defences prevent him removing the eye directly, so he tries to cut off Ao's head instead. Elsewhere, Killer B continues to attack Kisame, and Samehada continues to absorb and grow stronger from his chakra. By tapping into the Eight-Tails' chakra, B is able to strike Kisame before Samehada can stop him. Kisame is badly injured, but by fusing with Samehada the damage is repaired.